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  <title>综合案例</title>
  <style>
    * {
      padding: 0;
      margin: 0;
      box-sizing: border-box;
    }
 
    .container {
      width: 1200px;
      margin: 0 auto;
    }
 
    .video video {
      width: 100%;
      padding: 20px 0;
    }
 
    .elevator {
      position: fixed;
      top: 280px;
      right: 20px;
      z-index: 999;
      background: #fff;
      border: 1px solid #e4e4e4;
      width: 60px;
    }
 
    .elevator a {
      display: block;
      padding: 10px;
      text-decoration: none;
      text-align: center;
      color: #999;
    }
 
    .elevator a.active {
      color: #1286ff;
    }
 
    .outline {
      padding-bottom: 300px;
    }
  </style>
</head>
 
<body>
  <div class="container">
    <div class="header">
      <a href="http://pip.itcast.cn">
        <img src="https://pip.itcast.cn/img/logo_v3.29b9ba72.png" alt="" />
      </a>
    </div>
    <div class="video">
      <video src="https://v.itheima.net/LapADhV6.mp4" controls></video>
    </div>
    <div class="elevator">
      <a href="javascript:;" data-ref="video">视频介绍</a>
      <a href="javascript:;" data-ref="intro">课程简介</a>
      <a href="javascript:;" data-ref="outline">评论列表</a>
    </div>
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